Translucent structure

Abstract

To provide a translucent structure having a low haze factor and low sparkle. The translucent structure has an uneven structure at the surface thereof, wherein the uneven structure includes first convex portions 5 a , of which the diameters at a height of the bearing height+0.05 μm of the surface shape (a), obtainable by measuring the uneven structure by a laser microscope, are at least 1 μm, and in an image (c) in which a plurality of convex portions are scattered, obtained by filtering the surface shape (a) by image processing software to obtain a smoothing image (b), and subtracting XYZ data of the smoothing image (b) from XYZ data of the surface shape (a), said plurality of convex portions include second convex portions 5 b , of which the diameters at a height of 0.01 μm when the bearing height is deemed to be 0, are at least 0.4 μm, the density of the second convex portions is from 0.023 to 7.210 units/μm 2 , and the proportion of the total area in cross-section at a height of 0.01 μm of the second convex portions 5 b is from 0.900 to 90.000%.

What is claimed is: 
     
       1. A translucent structure, comprising:
 a translucent substrate; 
 an antiglare layer formed on the translucent substrate and having an uneven structure at a surface thereof; and 
 at least one functional layer formed on the uneven structure of the antiglare layer, the at least one functional layer having an uneven structure at a surface thereof forming an outermost surface of the translucent structure, 
 wherein the uneven structure of the at least one functional layer follows the uneven structure of the antiglare layer such that external light is diffusely reflected by the uneven structure of the outermost surface of the translucent structure, 
 the uneven structure of the outermost surface of the translucent structure includes first convex portions, such that diameters calculated as true circles of the first convex portions at a bearing height of a shape of the surface plus 0.05 μm are at least 1 μm, that an average value of the diameters of the first convex portions is from 1.000 to 16.000 μm, and that a density of the first convex portions is from 0.001 to 0.1 units/μm 2 , wherein the bearing height of the shape of the surface is obtained by measuring a rectangular region of from 101 μm×135 μm to 111 μm×148 μm of the uneven structure by a laser microscope, 
 when an image having a plurality of convex portions is obtained by filtering the shape of the surface of the antiglare layer by image processing software SPIP (manufactured by Image Metrology) to obtain a smoothing image and subtracting XYZ data of the smoothing image from XYZ data of the shape of the surface, the plurality of convex portions includes second convex portions such that diameters calculated as true circles of the second convex portions at a height of 0.01 μm when a bearing height is deemed to be 0, are at least 0.4 μm, that a density of the second convex portions is from 0.023 to 7.210 units/μm 2 , and that the total area in a cross section of the second convex portions at the height of 0.01 μm is from 0.900 to 90.000% of the entire area of the rectangular region, and 
 the translucent structure is a display of an image display device. 
 
     
     
       2. The translucent structure according to  claim 1 , wherein the average value of the diameters of the first convex portions is from 1.000 to 12.000 μm, the density of the second convex portions is from 0.023 to 0.180 unit/μm 2 , and the total area in the cross section of the second convex portions is from 1.000 to 22.400% of the entire area of the rectangular region. 
     
     
       3. The translucent structure according to  claim 2 , wherein the average value of the diameters of the first convex portions is from 1.000 to 8.000 μm, the density of the second convex portions is from 0.033 to 0.180 unit/μm 2 , and the total area in the cross section of the second convex portions is from 1.270 to 16.000% of the entire area of the rectangular region. 
     
     
       4. The translucent structure according to  claim 1 , wherein the antiglare layer is directly formed on the translucent substrate. 
     
     
       5. The translucent structure according to  claim 4 , wherein the antiglare layer is a film composed mainly of silica and having a pencil hardness in accordance with JIS K5600-5-4 of at least 5H. 
     
     
       6. The translucent structure according to  claim 1 , wherein the at least one functional layer comprises a water/oil-repellent layer such that a surface of the water/oil-repellent layer forms the outermost surface of the translucent structure. 
     
     
       7. The translucent structure according to  claim 1 , wherein a surface of the translucent substrate on which the antiglare layer is formed has arithmetic average roughness Ra of at most 10 nm. 
     
     
       8. The translucent structure according to  claim 1 , wherein the translucent substrate is a plate-form or film-form inorganic glass or resin material. 
     
     
       9. The translucent structure according to  claim 1 , wherein the at least one functional layer comprises an antireflection layer or a water/oil repellent layer. 
     
     
       10. The translucent structure according to  claim 1 , wherein the at least one functional layer comprises an antireflection layer and a water/oil repellent layer. 
     
     
       11. The translucent structure according to  claim 1 , which has a haze factor of from 0.1 to 15%. 
     
     
       12. The translucent structure according to  claim 1 , which is entirely curved, or at least partially curved. 
     
     
       13. The translucent structure according to  claim 12 , which comprises a curved part and a flat part. 
     
     
       14. The translucent structure according to  claim 13 , wherein a radius of curvature of the curved part is at most 25,000 mm. 
     
     
       15. The translucent structure according to  claim 13 , wherein a radius of curvature of the curved part is from 30 to 3,000 mm. 
     
     
       16. The translucent structure according to  claim 9 , wherein the antireflection layer comprises a low refractive index layer and a high refractive index layer such that the low refractive index layer and the high refractive index layer are alternately laminated. 
     
     
       17. The translucent structure according to  claim 16 , wherein the low refractive index layer comprises silicon oxide (SiO 2 ), and the high refractive index layer comprises at least one selected from the group consisting of niobium oxide (Nb 2 O 5 ), titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), silicon nitride (SiN) and tantalum oxide (Ta 2 O 5 ). 
     
     
       18. The translucent structure according to  claim 1 , wherein the density of the first convex portions is from 0.001 to 0.05 units/μm 2 . 
     
     
       19. The translucent structure according to  claim 1 , wherein the density of the second convex portions is from 0.023 to 0.180 units/μm 2 . 
     
     
       20. The translucent structure according to  claim 1 , wherein the antiglare layer comprises silica particles having an average particle diameter of 70 to 110 nm.